Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e76f04c8ceeeb5a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 23:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a537b97045fddab1003fb9a1c9370a85 SHA-1: 9df5800fdf1c61de9651efd7ffe471f8a30d3bf8 SHA-256: 1e76f04c8ceeeb5a1cd5481fd7e499ff4a192bd978ec39c186670c1aa5d753de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple potentially malicious domains. The presence of embedded URLs, including one with a 'download big files on android' query parameter, points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sumosushingrill.com/uploads/files/35430272065.pdf In PDF document text
    • https://daiichitravel.com/uploads/news_file/39320377983.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/13358429601.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nopulojawazotawime.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131929a1d65c---28975108680.pdfIn PDF document text
    • http://turatabor.hu/media/jarid.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/wixagevowugeloxenilu.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/323590577.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/lazomepobegusotejerula.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tapasolevoj.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/8118054543.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/37927766014.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/rodurogolokiwo.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/gujufunowipapemukefeni.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/nugasivipifazobulumugifox.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/15756048890.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sedolaj.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2419a893a864a956c5c35e74eaf62518/41462283830.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/zepovobupakepigalivu.pdfIn PDF document text
    • http://baoveantam.org/upload/files/xusur.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/96444425628.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wobinaxevulupok.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/resomerugolivijumovoge.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/97994479902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+big+files+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 14732 bytes
SHA-256: c7b92069f68475a9467a43717618124437c15b372992fd4617dd5c7e7d4dbeb3
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 10660 bytes
SHA-256: 6df645a6dd4e88e53d24ceca7c5c600f272d5fe6ea20f4e4346a32ce9f45c261